Rock drill



G. LEE

. nocx mum:

April 5, 1927.

Filed. June 1a. 1926 INVENTOR. ovdan Lee. V

1175 AT RNEY Patented Apr. 5, 1927.

nnate :eonnou LEE, ior EAs'reiv, PENNSYLVANIA, AssIGnoR TO 'ruennsorir-nann 001v,-

' PANY, OF JERSEY CITY, JERSEY, A CORPORATION OF NEWJEESEY;

ROCK DRILL."

Application filed June 18,

This invention relates to rock'drills', but more particularly to a pressure fluid controlling deidceforfiuid actuated rock drills of thehand held type. v

The objects of the invention'are to enable the pressure fluid controlling means to be actuated in an improved and simplified manner,-to reduce the number of parts of the devices of this character to a minimum and to protect the handleiof the drill'against breakage. I y

Other objects will be in part obvious and in part pointed out hereinafter. I

The 'inventionjconsists of the combination of elements and arrangement of parts having thegeneral mode" ofoperation substantially as hereinafter described more particularly pointed out in the appended claim's andillustrated inthe accon n panying drawings,-in which;

Figure 1 1s a sectlonal trate the invention, 7

Figure 2'is a sectional view taken through Figure 1 on the line 2-2 looking in the direction of-the arrows, and

Figure- 3 is g a transverse View taken through Figure 1 on the line 3 .3 looking in the direction of the arrows. i v

Referring to the drawings, the invention is shownembodiedin a rock drill having a cylinder A provided with a free exhaust port B. A hammer piston G is adapted to reciprocate in the cylinder A for the purpose of delivering blows to a drill steel Dextench ing into a front head E. The rearward end of the cylinder .A in this instance is closed by a back head F upon whichis seated a handle G having grip portions H' and J whereby the rock drill may beguided. A suitable closure for. the front end of the cylinder is provided by a front cylinder washer-K having rearward and forward ex tensions L and O to extendmto the cylinder,

A and the front head respectively for centralizing *these parts with respect to each other. 7 In addition'to serving the functions 'hereinbefore set forth, the front cylinder washer K also acts as a guide and a seat for an" anvil block P interposed between the piston G and the drill steel D for transmitting.

the blows of the piston to the drill steel.

Any suitable means may be provided for holding the parts comprising the casing as Well as the handle G of the drill asand elevation oft-so -much of, a rock drill as will serve to lllus- I 1926. Serial NO.'116,910.'

sembled relation, such means, however, )ref- .7

cylinderik and which"chamber cominuni cat-es with the rearwardrnd of a piston chamber B through passage S in] theiback headF.

r The piston illustrated in the drawings is no r cfth'e type adapted to control. the. distribu-r tion "of the pressure fluid to the opposite ends of the cylinder for actuating; the piston and has a rearward extension T, the

rearward end of which is constantly exposed to pressure fluid during the operation ofth'e o drill. In this instance, pressure fluid for impelling the piston forwardly is conducted, from the 7 through a passage U to a pointnear the forward end of. the chamber Pressure rearward end ofthe cha1nberR fluid thus a-dm'itted through thepassage U may'fiow around areduced portion V the extension T into the rearward end of amain piston chamberlV. The admission of pres sure fluid to the-{front end of the chamber W is in this instance effected through .a-pa'ssage X leading from the front end ofthe cylinder to commun cate with the chamber R at a point intermediate the ends ofthe passage U. Theipas age X, like the passage U is also controlled the piston -eX- tension I) and therearward end thereof is so positioned with respect to the chamber R that at about the time the hammer piston de livers its blow to the anvil block P, pressure fluid will flow through the pa sage X into the front endof the cylinder for impelling the pistonrearwardly. i

' The admission of pressure fluid from the V chamber Q into thepa'ssage S is controlled by'a throttle valve Y which is" adapted to seat on a valve seat Z formed at the opening of the passage S, adjacent the chamber 7 Q) A spring b'seated'with one end onthe bottom of the chamber Q and with its other end on the valve Y serves to hold 1 the valve on its seat.

In accordance with thepractice of the invention, the grip J is formed of smallerexternal diameter than the grip H thus forming a shoulder 0 at the inner end of the grip J to act as an abutment for a'hollow cups U shaped sleeve "(Z adapted to rotate on the grip J;. At the inner end of the sleeve cZ [,is formed a cam e to encircle'said sleeve and i'sa'dapted to rotate through a'slot f in the rearward face of the back head F. The slot ispreferahly directly in. line with the valve Y pseatQZ and is of such width that its sides engage 'slidabl'y the sides'of the can] e'for preventing end'wise moveniont'of the sleeve on'the grip J; A stem gv carried by the l valve is'guided in a horeh between'theva'lve seat Z and the slot 7'' and exten dskwith its freeend into the .slot erably, of such length that when thecani is ,in itsinoperativeposition, a slight clearance v will. exist between the steni and the end of I the'cam. i r

The stem 9 is pref- -Means are preferably provided for limiting rotative movement of the sleeve 61 on the gri -5.: A convenient means of accomplishing zthis is illustrated in Figures '1 and Bin-which a pinkis secured to an end wall of'the sleeve (Z and has an inwardly ex tending portion rotatable in an annular 'slot' Q formed in the end of'the' grip J VShoulder's '1" and s are preferably formed at iii 1 the endsof the slot 9 to act as abutments forthe portion '79 of the pin 70.

i 'Infass'embling the device, the'sleeve clmay 1 illustrated in the drawings.

' a may thenjbe placed on the back head F in firstbe 'disposedon the grip J inthe manner I position to enable the cam e to be in- Lfor the-purpose, may be secured to the drill r jfo'r clampingthe handle and the back head *in' operative'position to the cylinder A. a

ser' tediin' the slot f. Thereafter the side bolts-or screws, such as are commonly, used In, the operationof the device; whenever it is-"desired'to admit pressurefluid into the cylinderfA for reciprocating the piston C, the sleeve (Z may be rotated in a clockwise y direction as viewed from the right hand side of "the figures, Such rotation of the sleeve 'willcause the cam e to ride on'thefreeend i of the stem 9 and will thus unseat the valve Y. Continued rotation'in this direction of the sleeve d will carry the portion pof'the ,fpin; 76 against the shoulder s in the slot 0;

In this position ofthe sleeve, the valve Y be. fully openedand the valve may be thus held durine' the normaloperation ofthe' drill un'aiifectedby the ars andfshocks set up by the drill. jWhenever it is' desired to cutoff the supply of pressure fluid from the drillathe sleeve cl mayberotated in a -counterclockwise direction to. move' the cam efou't of cont'act with the stemg of the valve 'Y and the valve will then be forced quickly to its seat bythe spring I).

mechan'ism v in amount of pressure fluid to the rock drill The handle (it The advantages of this invention reside chiefly in the fact that the perimetric surfaces of the grip portions H a-nd J remain unbroken 7 throughout their lengths; lThis construction renders these grip portions strong and eliminates the chances of breakage which frequently occurs in drills of f thistype. means of the controlling 'hereinbefore described, the

may be accurately and efiiciently controlled. Another desirable advantage of this construction over other well known devices'of. V

fluid to the cylinder, ahandle secured to the back head for-guiding the drill. a sleeve rotatable on the handle, a cam on the sleeve for manipulating the 'throttle valve, and a slot in the back head cooperating withthe.

2. In a rock drill, the" combination of a cam for holding the sleeve onthe handle.

cylinder, a back head for thecylinder having a slot in one side, a throttle valve controlling the admission of pressure "fluid'to the cylinder. a'handle secured tothe back head for guiding the drill, a sleeve rotatable on one end of the handle, and a cam encircling one end of the sleeve for 'unseatlng the valve,

said cam being engaged by the slot to hold the sleeve against removal from thehandle.

' 3.111 a rock drillgthe combinatio'n'of'a cylinder, a back head for the cylinder having a slot in one side, a valve seat'on the oppositeside of the back head and in line with the. slot, a'throttle valve in the back head adapted to cooperate with the seat tocon- V trol the admission of pressure fluid into the cylinder, a stem on the valve extending'into f the slot, a handle secured to the back head for guiding the drill, a sleeve rotatable on the handle, and a cam encircling'one end of the sleeve and integral therewith to ,o'o-' operate with the stem for unseating" the va-l ve, said cam being rotatable through the I' slot whereby'it is engaged for holding the sleeve against endwise movement.

In testimony'whereof- Tliave signed this specification.

GORDON LEE. T 

